css/css-cascade/scope-cssom.html

<!DOCTYPE html>
<title>@scope - CSSOM</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-6/#the-cssscoperule-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id=style>
  @scope {}
  @scope (.a) {}
  @scope (.a) to (.b) {
    div {
      display: block;
    }
  }
  @scope to (.b) {}
</style>
<script>

// CSSScopeRule.cssText
test(() => {
  assert_equals(style.sheet.rules[0].cssText, '@scope {\n}');
}, 'CSSScopeRule.cssText, implicit scope');

test(() => {
  assert_equals(style.sheet.rules[1].cssText, '@scope (.a) {\n}');
}, 'CSSScopeRule.cssText, root only');

test(() => {
  assert_equals(style.sheet.rules[2].cssText, '@scope (.a) to (.b) {\n  div { display: block; }\n}');
}, 'CSSScopeRule.cssText, root and limit');

test(() => {
  assert_equals(style.sheet.rules[3].cssText, '@scope to (.b) {\n}');
}, 'CSSScopeRule.cssText, limit only');

// start
test(() => {
  assert_equals(style.sheet.rules[0].start, null);
}, 'CSSScopeRule.start, implicit scope');

test(() => {
  assert_equals(style.sheet.rules[1].start, '.a');
}, 'CSSScopeRule.start, root only');

test(() => {
  assert_equals(style.sheet.rules[2].start, '.a');
}, 'CSSScopeRule.start, root and limit');

test(() => {
  assert_equals(style.sheet.rules[3].start, null);
}, 'CSSScopeRule.start, limit only');

// end
test(() => {
  assert_equals(style.sheet.rules[0].end, null);
}, 'CSSScopeRule.end, implicit scope');

test(() => {
  assert_equals(style.sheet.rules[1].end, null);
}, 'CSSScopeRule.end, root only');

test(() => {
  assert_equals(style.sheet.rules[2].end, '.b');
}, 'CSSScopeRule.end, root and limit');

test(() => {
  assert_equals(style.sheet.rules[3].end, '.b');
}, 'CSSScopeRule.end, limit only');

test(() => {
  assert_true(style.sheet.rules[0] instanceof CSSGroupingRule);
  assert_false(style.sheet.rules[0] instanceof CSSConditionRule);
}, 'CSSScopeRule is a CSSGroupingRule');
</script>